This is permissible for necessity.

My exam is starting at 12 noon and end at 3 pm. Dhuhr is around 1pm.  Am I allowed to skip salah because I am doing exam and pray immediately after the exam? Asr time is 4pm.

Prayer | December 26, 2014 2:32 pm
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The least for any prayer to be accepted, sunnah prayer or fard prayer, is to recite al Fatiha in every rakah. Am I correct?
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 I wanted to know whether it is permitted to raise the index finger between the two prostrations as we do in tashahhud ?